Biological leaching process for separating out metal ions from waste battery directly

[0031] Example 1.

[0032] Taking chemical leaching and biological leaching to compare the leaching efficiency of metals from three types of used batteries (nickel-cadmium batteries, zinc-manganese batteries, and lithium-ion batteries) as an example, the specific operations are as follows:

[0033] 1) After disassembling the waste battery and removing the single components such as copper cap, aluminum foil, zinc foil, film, carbon rod, etc., collect the battery positive and negative electrode materials with complex composition and the most concentrated metal content, carefully crush them into powder and pass through a 20-mesh sieve And bottling for later use;

[0034] 2) Prepare, inoculate, and shake up several bottles of 100mL culture solution according to the conditions of acid-producing culture solution. When the pH drops to 2.0, add 1.0g of the stripped electrode mixed material, and put it in the shaker for biological leaching. Add the specified battery at the initial pH value, and then incubate at a certain temperature;

[0035] 3) Use 0.5mol/L H 2 SO 4 Prepare a chemical acid leaching solution with a pH of 2.0 and a volume of 100mL, add 1.0g battery electrode material for chemical leaching, and regularly take samples to determine the pH change of the two solutions and the change of the cobalt ion concentration of the solution;

[0036] 4) The results show that under the condition of initial pH=2.0, the maximum leaching concentration of nickel-cadmium in the nickel-cadmium battery by the biological leaching system is 274mg/L and 474mg/L, and the leaching concentration of zinc and manganese in the zinc-manganese battery is 590mg/L. L and 400mg/L, the leaching concentration of cobalt in the lithium-ion battery is 306mg/L; while the leaching concentration of the above ions in the chemical leaching system does not exceed 10mg/L. Biological leaching shows great advantages and high efficiency compared with chemical leaching.

[0037] Example 2.

[0038] Take the use of biological leaching technology to treat waste zinc-manganese batteries as an example, the specific operations are as follows:

[0039] 1) Same as Example 1(1);

[0040] 2) Prepare, inoculate, and culture several bottles of 100mL culture solution on a shaker according to the conditions of the acid-producing culture solution (the concentration of sulfur powder is 2.0g/L, 3.0g/L, 4.0g/L respectively), at the designed initial pH value (2.0, 3.0, 4.0), add the specified batteries (0.5g, 1.0g, 1.5g), and then incubate at a certain temperature (27°C, 35°C, 42°C);

[0041] 3) Regularly take samples and measure the pH change of the solution and the change of metal ion concentration in the solution;

[0042] 4) The experimental results show: when the pH value is 2.0, the sulfur powder concentration is 4.0g/L, and the battery dosage is 1.0g, the dissolved zinc and manganese ions in the waste zinc-manganese battery are 500mg/L and 800mg/L, respectively. L. At pH1.0, the dissolved concentrations of zinc and manganese ions were 989mg/L and 1018mg/L, respectively.

[0043] Example 3.

[0044] Take the use of biological leaching technology to process waste nickel-hydrogen batteries as an example, the specific operations are as follows:

[0045] 1)-3) Same as Example 2(3);

[0046] 4) The results show that when the pH value is 2.0, the sulfur powder concentration is 4.0g/L, and the battery dosage is 1.0g, the nickel dissolution concentration in the cathode material of the waste nickel-hydrogen battery is 1938mg/L, respectively. At pH 1.0, the eluted concentration of nickel in the positive electrode material is 4976 mg/L, and the eluted concentration of cobalt is 240 mg/L.